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Earnings (loss) per share | 12 Months Ended
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Dec. 31, 2017
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Earnings (loss) per share |
26. | Earnings (loss) per share
Basic earnings per share amounts are calculated by dividing the net profit (loss) for the year attributable to ordinary equity holders of the parent by the weighted average number of shares outstanding during the year, increased by the number of non-vested dividend participating share-based payment awards outstanding during the period. Diluted earnings per share amounts are calculated by dividing the net profit (loss) attributable to ordinary equity holders of the parent by the weighted average number of ordinary shares outstanding during the year plus the weighted average number of ordinary shares that would be issued on conversion of all the dilutive potential ordinary shares into ordinary shares, when the effect of their inclusion is dilutive (decreases earnings per share or increases loss per share). The computation of the income (loss) and share data used in the basic and diluted earnings per share is as follows:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Basic earnings (loss) per share - |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ | 369,658 |  |  | $ | 325,928 |  |  | $ | (240,634 | )
Weighted-average shares outstanding |  |  | 42,111 |  |  |  | 42,036 |  |  |  | 43,716 |
Non-vested dividend participating awards |  |  | 308 |  |  |  | 322 |  |  |  | 145 |
|  |  | 42,419 |  |  |  | 42,358 |  |  |  | 43,861 |
|  |  | 8.71 |  |  |  | 7.69 |  |  |  | (5.49 | )
|  | 2017 |  |  | 2016 |  |  | 2015 |
Diluted earnings (loss) per share - |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ | 369,658 |  |  | $ | 325,928 |  |  | $ | (240,634 | )
Weighted-average shares outstanding used for basic earnings per share |  |  | 42,419 |  |  |  | 42,358 |  |  |  | 43,861 |
Share options on issue |  |  | — |  |  |  | 5 |  |  |  | 8 |
|  |  | 42,419 |  |  |  | 42,363 |  |  |  | 43,869 |
|  |  | 8.71 |  |  |  | 7.69 |  |  |  | (5.49 | )

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=sect_Disclosure&doctype=Standard -URIDate 2017-03-09 + Details
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